Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a300e633d58a65b…

MALICIOUS

PDF

85.1 KB Created: 2021-07-06 23:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ed1d484d0dac57d497a62baa4ab3108 SHA-1: e9ef0e6c93d976469a5524f473f98e10568ecb50 SHA-256: 2a300e633d58a65bb69060a1f8baa0b4147c009282bfd1d91d6b65aa759aa279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. This suggests the PDF is designed to lure users to these compromised hosts, potentially for further exploitation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707915d9970---koxanokokiva.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cbd3541db---sazapolisojufu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/muzesozixesaguwakil.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/80934329711.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9afbcc52a4982b052936e19976c46e9b/kojubolopotuwezivu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2122905add---98723614132.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/momasisopirigebikozepavig.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/fexoronom.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1fcd4fb5---zojewavelalagunigogegama.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/h2g53hi0st8k3mq4vbu3vishpv/paravodojunibuxij.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/91401739377.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/kuluwa.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/24efd537df430cc2359e120d88169b6f/12504800314.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/genigufa.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b712fe9a92---sepolanizikalojeze.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/nanefunimadegafagal.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/puneg.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/vesosolebale.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609e763143fb5---giroka.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec8396488---95064816997.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160beb000bc467---21800741461.pdfIn PDF document text
    • https://agatanorek.com/files/file/tuxejakebever.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b6014b89bf5d48f9016783e1b1fd39e2/bodidonukidudakav.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f412218d57d4be2e3a965934c7a4aecf/84603142296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=philosophical+meaning+in+marathiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 16624 bytes
SHA-256: 19a94ea42b95e214333bd4a40ebf2155100a7dbcd800d0b1e6e727d675e7d3d3
font_01_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE8 10820 bytes
SHA-256: 686ef30f433d8f1ed880e00ed7656d22cdb17ddb199d293edaf36ff4aea818f1

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